105,282 research outputs found
OH040 John H. Burd Oral History
No full textJohn Burd discusses his activities as a moonshine runner during the prohibition era in Graves and Trigg Counties, Kentuck
Three-dimensional modelling of the interaction between buildings and tunnelling operations
No full textAn extensive programme of research has been carried out at Oxford University on finite elementanalysis of the interaction between masonry buildings and ground movements induced by tunnelling. The focushas been on the development of a predictive tool for assessing the probable damage to buildings. This paperpresents a brief summary of the work, with reference to other more detailed papers. The method is illustratedwith reference to the case of the Ramsgate harbour approach tunnel, in which a large diameter tunnel in chalkwas excavated at very low cover directly beneath a row of cottages. Both field measurements and analyses revealthat in this case the building responds flexibly, following rather closely the greenfield settlements, which weresmall. The slight damage to the buildings was also correctly modelled
Congressional Record Tribute: Burd, James E.
No full textCommander Burd received his Masters Degree in Aeronautical Engineering from the Naval Postgraduate School.Mr. BORSKI. Mr. Speaker, I would like to extend my deepest congratulations to Commander James E. Burd, the Commanding Officer of the Naval Air Technical Services Facility, on his retirement. Commander Burd was born in Harrisburg and raised in Pittsburgh, Pennsylvania. In 1975 he graduated from the United States Naval Academy and he obtained of his pilot wings a year later. He was initially assigned to a Helicopter Combat Squadron and flew an H–46D helicopter aboard the USS White Plains (AFS–4), USS Midway (CV–41), and USS Niagara Falls (AFS–3) in the Pacific and Indian Oceans. In 1980, Commander Burd received his Masters Degree in Aeronautical Engineering from the Naval Postgraduate School. He also attended the Defense Systems Management College where he issued over 2,200 individual engineering safety clearances for almost every aircraft and aviation weapon system in the Navy and Marine Corps inventory, in addition to the prototype and classified systems successfully employed during Desert Storm. While aboard the USS Shasta (AE–33), he demonstrated true heroism by helping to save an aircraft from a ditching situation. By 1984, he was appointed as an Aeronautical Engineering Duty Officer, yet he still found the time to volunteer as a Detachment Officer in Charge of a helicopter deployment aboard USS Flint (AE–32).Approved for public release; distribution is unlimited
Famous People: Autographs and Photographs, Col. James Burd
No full textBlack and white photograph of a painting of Colonel James Burd, used in one of the Olive Woolley Burt\u27s book
I. Degree Holders Face Cloudy Future in Depressed Knowledge Industry
No full text The AEJ Theory and Methodology Division's Teaching Committee will present preliminary results of a Ph.D. manpower study at a session Aug. 19 during the AEJ convention in Ft. Collins, Colo. Data will include a survey of doctorate production in communications fields and estimates of job openings in the next decade. Meanwhile, debate continues in many university circles over how important doctorate degrees are to journalism education. Four views — by Gene Burd, Curtis D. MacDougall, William R. Lindley and Steven H. Chaffee — are presented in the pages that follow. </jats:p
Bioavailability of nitrogen, phosphorus, iron and cobalt to surface water planktonic microbes in the low latitude Atlantic Ocean
No full textThe effects on bacterioplankton of very low concentrations of nitrogen and phosphorus/iron in the Atlantic were investigated using shipboard enrichment experiments. In the North Atlantic gyre, bacterioplankton abundance and amino acid uptake increased upon combined addition of ammonium and phosphate (9-42% and 120-880% increase, respectively). Outside the gyre, the requirement for phosphate additions was reduced. In the South Atlantic, ammonium additions generally caused an increase in bacterioplankton abundance (10-32% after 48 h) and amino acid uptake (20-300%), particularly in the gyre centre. Conversely, iron additions showed a negligible response. These results contribute towards understanding the effect of low nutrient concentrations on bacterioplankton. Reduced abundance or metabolic activity of bacterioplankton due to low nutrient concentrations may impact marine primary production and carbon fluxes, which is a particular concern due to the expansion of oligotrophic gyres as a result of climate change.
Iron and cobalt are essential micronutrients that are susceptible to forming particulate/insoluble species (e.g. via adsorption, oxidation, precipitation). These species can be lost from the surface ocean, thus reducing nutrient bioavailability. Therefore, mechanisms affecting their formation were also investigated. Cell surface iron adsorption was measured in the South Atlantic, with highest levels occurring in the gyre (~180-300 zmol Fe/cell, verses ~3-155 zmol Fe/cell in productive waters). This was hypothesised to be due to low ambient iron in the gyre, resulting in a larger free cell surface area for iron binding. Particulate cobalt formation was enhanced (>150%) in the presence of Aurantimonas (a manganese-oxidising bacteria), was generally elevated under higher manganese concentrations (e.g. ~13-60% increase upon adding MnCl2 to manganese-poor cultures), but was slightly reduced in the presence of nickel (6.2±7.4% decrease) or copper (7.4±12.2% decrease). These results further understanding of factors influencing micronutrient speciation, which is especially important considering potential changes to ocean biogeochemistry as a result of anthropogenic activity
THE EFFECT OF MEDROXYPROGESTERONE ACETATE ON PREMATURE LABOR IN THE SHEEP
No full textThe ability of medroxyprogesterone acetate to premature delivery delay was investigated in nine chronically catheterized pregnant sheep (125 to 130 days' gestation). Catheters were placed for measurement of intrauterine pressure and uterine vein concentrations of progesterone,17 beta-estradiol,and 15-keto-13,14-dihydroxyprostaglandin F2a. Premature parturition was induced in all animals by infusion of dexamethasone (1 mg/24 hours) to the fetus. Three ewes served as controls,three ewes received oral medroxyprogesterone acetate (5 mg/kg/day) 48 hours prior to the start of and during dexamethasone (early medroxyprogesterone acetate),and the remaining three animals received oral medroxyprogesterone acetate 12 hours after the onset of dexamethasone infusion (late medroxyprogesterone acetate). The lengths of time from dexamethasone until the onset of labor and from dexamethasone until delivery were compared,and were significantly longer for each group compared to control times. Of all endocrine events analyzed,the fall in plasma progesterone was the most consistent in all groups,showing that animals with rapid falls in progesterone levels (control group) tended to deliver earlier. These results demonstrate that medroxyprogesterone acetate can delay premature parturition in the sheep. Also medroxyprogesterone acetate appears to delay the endocrinologic events that normally occur at this tim
Finite element studies of reinforced and unreinforced two-layer soil systems
No full textThe purpose of this study is to obtain an insight into the mechanisms by which a geosynthetic membrane influences the performance of a plane strain and an axisymmetric two-layer soil system, where the reinforcement is incorporated either into a layer of fill, or at the interface of a layer of fill overlying clay subgrade. New axisymmetric membrane and interface element formulations are developed and incorporated in to an existing large strain finite element code. A linear elastic model of behaviour is used for the membrane material and an elastic-perfectly frictional model, based on the Mohr-Coulomb yield function, is implemented for the interface. These new formulations both take account of large global displacement and rotation effects, although the interface element is constrained to small relative displacements, and are checked against small and large strain closed form test problems. The finite element equations are based on an Updated Lagrangian description of deformation. Plane strain finite element investigations into the significance of the resolution and relative size of the finite element mesh, and the differences between large and small strain analyses, are undertaken. For typical unreinforced and reinforced plane strain and axisymmetric two- layer soil systems a detailed analysis is presented of the soil displacements, strains, stresses, principal stress directions, mobilised fill friction angles and the stresses on the underside of the footing. A series of plane strain and some axisymmetric parametric studies of the various material properties is conducted, to assess the influences and relative importance of those variables to the performance of the two-layer soil system under monotonic loading. The study considers various reinforcement lengths and stiffnesses, fill depths and strengths, and different clay strengths. The mechanisms of reinforcement are identified through careful examination of the footing load-displacement response, the reinforcement tension and the stresses and displacements at the interfaces with the surrounding soil. A comparative study is also undertaken between the results obtained by the finite element model and those predicted by a plane strain and axisymmetric limit equilibrium design method. The effects of including a low friction membrane within an oil storage tank base, as secondary containment against oil leakage, are investigated by a series of axisymmetric finite element analyses
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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